EPA Method 500 Series Internal Std #4 Back Catalog number: 32003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673187 Aclonifen, 100 µg/ml, Acetonitrile, 5ml Price on request 50039 Potassium Bromide Price on request 1315.13-10-T 2-Fluorofluorene, 10µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 343-43-1 Price on request